Giant, dense structures ... were denser than the Moon, and so their mass became part of the Moon after they crashed into it. Yet, there’s no visible trace of Mars’s newly-discovered ...

While the car-sized spacecraft flew around the Mars system, flight controllers on Earth temporarily lost communication with ...

One proposes that passing asteroids were captured whole by Mars's gravity, which could explain the moons' somewhat asteroid-like appearance. The other says that a giant impact on the planet ...

A space probe named Hera captured images of Mars' small Deimos moon while on a mission to examine an asteroid.

The results of Hera's flyby could ultimately tell us whether Deimos is a captured asteroid or made from debris from a giant impact ... new images of Mars' little-seen moon Deimos, which could ...

Mars' moon Deimos silhouetted against the red planet, which appears blue from an infrared image, as captured by ESA’s Hera spacecraft. Photo / AFP On the way to investigate the scene of a ...

is that the moon formed during a giant impact between the proto-Earth, and another protoplanet roughly the size of Mars, sometimes called “Theia.” In this theory, the moon formed from the impact ...